Product Overview
The FEETECH SM45BL is a high precision RS485 bus brushless servo designed for robotic joints, automation systems and intelligent motion control applications. Featuring a brushless motor, full steel gear transmission and 12-bit magnetic encoder feedback, the SM45BL delivers stable torque output, accurate positioning and reliable continuous operation.
This servo supports RS485 serial communication and multiple control modes including position control, speed control and PWM control, making it suitable for robotic arms, humanoid robots, AGV platforms and industrial automation equipment.
Product Features
High Precision Magnetic Encoder
Built-in 12-bit magnetic encoder with 0.088° position resolution for accurate angle feedback and smooth motion control.
Brushless Motor Design
Brushless structure reduces wear and improves operating lifespan for long-term continuous use.
RS485 Bus Communication
Supports RS485 serial bus communication with adjustable baud rate from 38400 to 1000000.
Full Steel Gear Transmission
1:353 steel gear reduction structure provides stable torque transmission and improved durability.
360° Multi-turn Position Control
Supports multi-turn motion range from -360°×7 to 360°×7 for robotic joint applications.
Multiple Control Modes
Supports:
- Position control
- Speed control
- PWM control
Dual Shaft Structure
Dual shaft output design provides flexible mechanical installation options.
Technical Specifications
| Item | Specification |
|---|---|
| Model | SM45BL |
| Weight | 100g |
| Dimensions | 46.5 × 28.5 × 34 mm |
| Working Voltage | 12V–24V |
| Operating Temperature | -20°C ~ 80°C |
| Static Current | 17mA @24V |
| No-load Current | 160mA @24V |
| Stall Current | 2300mA @24V |
| Stall Torque | 45kg.cm @24V |
| Rated Torque | 15kg.cm (1.3N.m) @12V |
| Maximum Speed | 70RPM |
| Encoder Type | 12-bit Magnetic Encoder |
| Position Resolution | 0.088° |
| Gear Ratio | 1:353 |
| Communication Interface | RS485 |
| Baud Rate | 38400 ~ 1000000 |
| Control Frequency | 333Hz |
| Position Range | -360°×7 ~ 360°×7 |
| Control Modes | Position / Speed / PWM |
Applications
- Humanoid robots
- Robotic arms
- Robot joints
- AGV robots
- Intelligent manufacturing
- Automation equipment
- Educational robotics
- Motion control systems
Package Includes
Servo Only Package
- 1 × SM45BL Servo
- Mounting brackets
- Mounting screws
- Servo cables
Servo + URT Debug Board Package
- 1 × SM45BL Servo
- URT debug board
- USB cable
- Mounting brackets
- Mounting screws
- Servo cables
Product Advantages
- Brushless long-life design
- Full steel gear transmission
- High precision encoder feedback
- RS485 bus communication
- Multi-turn positioning support
- Multiple control modes
- Compact structure for robotics integration
